The downstream evolution of the vorticity field in the vicinity of hairpin-shaped regions of rotational motion appearing in the transitioning boundary layer is examined. It is shown that the dynamics of hairpins is inseparable from that of the nonrotational vorticity out of which they develop in a self-reinforcing process of ejection and reorientation. Widening the concept of structure to include the complete localized vorticity that produces hairpins, allows for a more complete and self-contained explanation of the boundary layer physics.
Boundary Layer Vortical Structure Vorticity Field Viscous Sublayer Vortex Filament
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This research was supported in part by the National Science Foundation through XSEDE resources provided by the Pittsburgh Supercomputing Center.